gcc/config/i386/sol2.h

   1 /* Target definitions for GCC for Intel 80386 running Solaris 2
   2    Copyright (C) 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   3    2004, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
   4    Contributed by Fred Fish (fnf@cygnus.com).
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 /* The Solaris 2.0 x86 linker botches alignment of code sections.
  23    It tries to align to a 16 byte boundary by padding with 0x00000090
  24    ints, rather than 0x90 bytes (nop).  This generates trash in the
  25    ".init" section since the contribution from crtbegin.o is only 7
  26    bytes.  The linker pads it to 16 bytes with a single 0x90 byte, and
  27    two 0x00000090 ints, which generates a segmentation violation when
  28    executed.  This macro forces the assembler to do the padding, since
  29    it knows what it is doing.  */
  30 #define FORCE_CODE_SECTION_ALIGN  asm(ALIGN_ASM_OP "16");
  31
  32 /* Old versions of the Solaris assembler can not handle the difference of
  33    labels in different sections, so force DW_EH_PE_datarel.  */
  34 #undef ASM_PREFERRED_EH_DATA_FORMAT
  35 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)                       \
  36   (flag_pic ? ((GLOBAL ? DW_EH_PE_indirect : 0)                         \
  37                | (TARGET_64BIT ? DW_EH_PE_pcrel | DW_EH_PE_sdata4       \
  38                   : DW_EH_PE_datarel))                                  \
  39    : DW_EH_PE_absptr)
  40
  41 /* The Solaris linker will not merge a read-only .eh_frame section
  42    with a read-write .eh_frame section.  None of the encodings used
  43    with non-PIC code require runtime relocations.  In 64-bit mode,
  44    since there is no backwards compatibility issue, we use a read-only
  45    section for .eh_frame.  In 32-bit mode, we use a writable .eh_frame
  46    section in order to be compatible with G++ for Solaris x86.  */
  47 #undef EH_TABLES_CAN_BE_READ_ONLY
  48 #define EH_TABLES_CAN_BE_READ_ONLY (TARGET_64BIT)
  49
  50 /* Solaris 2/Intel as chokes on #line directives.  */
  51 #undef CPP_SPEC
  52 #define CPP_SPEC "%{,assembler-with-cpp:-P} %(cpp_subtarget)"
  53
  54 /* FIXME: Removed -K PIC from generic Solaris 2 ASM_SPEC: the native assembler
  55    gives many warnings: R_386_32 relocation is used for symbol ".text".  */
  56 #undef ASM_SPEC
  57 #define ASM_SPEC "\
  58 %{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Wa,*:%*} -s \
  59 %(asm_cpu) \
  60 "
  61
  62 #define ASM_CPU_SPEC ""
  63
  64 #undef SUBTARGET_EXTRA_SPECS
  65 #define SUBTARGET_EXTRA_SPECS \
  66   { "cpp_subtarget",    CPP_SUBTARGET_SPEC },   \
  67   { "asm_cpu",          ASM_CPU_SPEC },         \
  68   { "startfile_arch",   STARTFILE_ARCH_SPEC },  \
  69   { "link_arch",        LINK_ARCH_SPEC }
  70
  71 #undef LOCAL_LABEL_PREFIX
  72 #define LOCAL_LABEL_PREFIX "."
  73
  74 /* The 32-bit Solaris assembler does not support .quad.  Do not use it.  */
  75 #ifndef HAVE_AS_IX86_QUAD
  76 #undef ASM_QUAD
  77 #endif
  78
  79 /* The Solaris assembler wants a .local for non-exported aliases.  */
  80 #define ASM_OUTPUT_DEF_FROM_DECLS(FILE, DECL, TARGET)   \
  81   do {                                                  \
  82     const char *declname =                              \
  83       IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));  \
  84     ASM_OUTPUT_DEF ((FILE), declname,                   \
  85                     IDENTIFIER_POINTER (TARGET));       \
  86     if (! TREE_PUBLIC (DECL))                           \
  87       {                                                 \
  88         fprintf ((FILE), "%s", LOCAL_ASM_OP);           \
  89         assemble_name ((FILE), declname);               \
  90         fprintf ((FILE), "\n");                         \
  91       }                                                 \
  92   } while (0)
  93
  94 /* Follow Sun requirements for TLS code sequences and use Sun assembler TLS
  95    syntax.  */
  96 #undef TARGET_SUN_TLS
  97 #define TARGET_SUN_TLS 1
  98
  99 /* The Sun assembler uses .tcomm for TLS common sections.  */
 100 #define TLS_COMMON_ASM_OP ".tcomm"
 101
 102 /* Similar to the Sun assembler on SPARC, the native assembler requires
 103    TLS objects to be declared as @tls_obj (not @tls_object).  Unlike SPARC,
 104    gas doesn't understand this variant.  */
 105 #ifndef USE_GAS
 106 #undef  ASM_DECLARE_OBJECT_NAME
 107 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)               \
 108   do                                                            \
 109     {                                                           \
 110       HOST_WIDE_INT size;                                       \
 111                                                                 \
 112       if (targetm.have_tls && DECL_THREAD_LOCAL_P (DECL))       \
 113         ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "tls_obj");      \
 114       else                                                      \
 115         ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");       \
 116                                                                 \
 117       size_directive_output = 0;                                \
 118       if (!flag_inhibit_size_directive                          \
 119           && (DECL) && DECL_SIZE (DECL))                        \
 120         {                                                       \
 121           size_directive_output = 1;                            \
 122           size = int_size_in_bytes (TREE_TYPE (DECL));          \
 123           ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size);         \
 124         }                                                       \
 125                                                                 \
 126       ASM_OUTPUT_LABEL (FILE, NAME);                            \
 127     }                                                           \
 128   while (0)
 129 #endif
 130
 131 /* The Solaris assembler cannot grok .stabd directives.  */
 132 #undef NO_DBX_BNSYM_ENSYM
 133 #define NO_DBX_BNSYM_ENSYM 1
 134
 135 /* Solaris-specific #pragmas are implemented on top of attributes.  Hook in
 136    the bits from config/sol2.c.  */
 137 #define SUBTARGET_INSERT_ATTRIBUTES solaris_insert_attributes
 138 #define SUBTARGET_ATTRIBUTE_TABLE SOLARIS_ATTRIBUTE_TABLE
 139
 140 /* Register the Solaris-specific #pragma directives.  */
 141 #define REGISTER_SUBTARGET_PRAGMAS() solaris_register_pragmas ()
 142
 143 /* Output a simple call for .init/.fini.  */
 144 #define ASM_OUTPUT_CALL(FILE, FN)                               \
 145   do                                                            \
 146     {                                                           \
 147       fprintf (FILE, "\tcall\t");                               \
 148       ix86_print_operand (FILE, XEXP (DECL_RTL (FN), 0), 'P');  \
 149       fprintf (FILE, "\n");                                     \
 150     }                                                           \
 151   while (0)
 152
 153 /* We do not need NT_VERSION notes.  */
 154 #undef X86_FILE_START_VERSION_DIRECTIVE
 155 #define X86_FILE_START_VERSION_DIRECTIVE false
 156
 157 /* Only recent versions of Solaris 11 ld properly support hidden .gnu.linkonce
 158    sections, so don't use them.  */
 159 #ifndef TARGET_GNU_LD
 160 #define USE_HIDDEN_LINKONCE 0
 161 #endif
 162
 163 /* Put all *tf routines in libgcc.  */
 164 #undef LIBGCC2_HAS_TF_MODE
 165 #define LIBGCC2_HAS_TF_MODE 1
 166 #define LIBGCC2_TF_CEXT q
 167 #define TF_SIZE 113
 168
 169 #define MD_UNWIND_SUPPORT "config/i386/sol2-unwind.h"